Question

please help

Answer 1

@jtvatsim

Answer 2

@zzr0ck3r

Answer 3

I am having the same problem as last time. I can't open it. I will be right back, my wife needs some help.

Answer 4

can you open it now?

Answer 5

nope

Answer 6

I only have wordpad on this pc.

Answer 7

ok. let me post it one by one but its up to ten

Answer 8

1 Let X= {x,y} and
T=ϕ,X,x
.Determine the closed set

a)X

b) X,{y}


c)X,ϕ,y
d) x,y

Answer 9

take a screen shot and post the jpg.

Answer 10

ϕ means empty set

Answer 11

i choosed c

Answer 12

`\(\emptyset\)`

Answer 13

Should it say \(\mathcal{T}=\{\emptyset, X, \{x\}\}\)

?

Answer 14

yes that is the topology

Answer 15

the question is what are the closed sets?

Answer 16

sec, can you post a pic? I am not sure if I am getting everything. I think it is missing a bunch of \(\{,\}\).

Answer 17

\[\let X={x,y} and ....T={\emptyset,X,x} \] what are the closed sets

Answer 18

x is not a set here. should it say \(\{x\}\)?

Answer 19

Sorry man, this all makes a huge difference. I cant answer without seeing the question. as it is posted it cant be answered. \(\{X,\{y\}\}\) is weird...

Answer 20

may be it was a typo error. they din't close i think they out to

Answer 21

@zzr0ck3r

Answer 22

the only thing that is a set is X and it is closed.

Answer 23

The other choices are not sets.

Answer 24

And if they are they are not subsets of the space X, and thus are not closed with respect to the given topology

Answer 25

assuming the the question was set correctly, what option should have been correct ?

Answer 26

These questions are all messed up, they dont make sense...

Answer 27

for something to be closed, they need to be a subset of the space, the only thing that was a subset of the space was the space itself.

Answer 28

which implies that it out to be A

Answer 29

yes, but the others are not even defined. I think where ever you got this, there is a problem with displaying all the characters.

Answer 30

the thing they call a topology is not even a topology, as a topology is a set, and must have parentheses around it.

Answer 31

ok thanks

Answer 32

since I assume there should be parentheses, well then I dont know if they mean for there to be parentheses on other things, and without that information this cant be answerd.

Answer 33

A space
(X,Td)

is called____________ if and only if (i)
ϕϵ

(ii) T contain open set whose compliment are finite sets
discrete topology
indiscrete topology
cofinite topology
metric topology

Answer 34

i think indiscrete topology

Answer 35

you are not listening when I tell you that I cant answer anything from that page. If you have something else I will gladly help, but theses questions are messed up. Ill check back tomorrow.

Answer 36

sir, in the first question i asked . i assume that the option B is not correct because ,it is not in T. right ?

Answer 37

i.e {y} is not in T